Ring-Focus Spectacle Lens With Seamless Defocus Zones
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Solution Overview
Problem
Existing spectacle lenses designed to control myopia progression, such as defocus lenses, often cause aesthetic issues due to visible joints between concentric rings with different optical powers, which deter patients from wearing them, and traditional methods like atropine eye drops and orthokeratology lenses have safety concerns and side effects.
Innovation Solution
A ring-focus spectacle lens design with a convex front surface and concave rear surface, featuring staggered correction and astigmatism zones defined by curved surfaces with continuous or transitional connections, eliminating visible joints and using a reduced number of mold cores for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If concentric rings with different optical powers are incorporated into spectacle lens, then defocusing function for myopia control is achieved, but visible joints appear between rings affecting aesthetics
Solution Approach 1:
The patent applies curved surface design where the first and second curved surfaces are joined in a tangent and continuous manner, creating a smooth transition between regions of different optical powers. This curvature-based joining eliminates visible joints while maintaining the defocusing function through alternating concentric rings of correction and astigmatm zones.
Solution Approach 2:
The patent implements local quality by creating zones with different optical properties (correction zones with first refractive power and astigmatism zones with second refractive power) in specific concentric ring patterns. Each zone is optimized for its local function while the tangent joining ensures global aesthetic continuity.
2Manufacturing precision
If multiple mold cores are used to manufacture ring-focus spectacle lenses with different optical powers, then manufacturing precision is improved, but production cost increases
Solution Approach 1:
The patent merges the manufacturing process by using only three anterior mold cores and a set of posterior mold cores to produce the entire series of ring-focus spectacle lenses with different myopia and astigmatism degrees. This consolidation reduces the number of mold cores needed while maintaining manufacturing precision through the standardized mold core design that accommodates various optical power combinations.
Solution Approach 2:
The patent creates universal mold cores that can manufacture multiple types of lenses (different myopia degrees and astigmatism degrees) through a single set of three anterior mold cores and posterior mold cores. This multi-functional approach reduces inventory requirements and production costs while maintaining the ability to produce precise optical power specifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lens provides clear vision while inhibiting myopia progression with aesthetic appeal, reducing production costs through fewer mold cores and ensuring patient comfort and safety.
Implementation Method 1
The front surface comprises a free-form surface composed of a plurality of first curved surfaces and a plurality of second curved surfaces... the first curved surfaces and the second curved surfaces are joined in a staggered way in the free-form surface
Implementation Method 2
a plurality of astigmatism zones for imaging light in front of the retina... the astigmatism zones have a second refractive power which is greater than the first refractive power
Data Source
AI summary
A ring focus spectacle lens (1) for controlling the progression of myopia, and a manufacturing method therefor. The ring focus spectacle lens (1) can provide clear vision for a patient, and also has a plurality of ring-shaped defocusing zones to provide an optical defocusing effect. Since there is no joint between successive concentric rings of different optical powers that are tangent to each other, the ring focus spectacle lens (1) is as aesthetic as a common spectacle lens. In the manufacturing method, three front mold cores (71), a rear mold core (72), and a planar rear mold core are used to manufacture a series of ring focus spectacle lenses (1) having different powers, thereby reducing the number of mold cores and the production cost. In addition, for the requirements of individuals with severe myopia and astigmatism, a semi-finished lens is provided by means of the manufacturing method, which not only greatly reduces the number of mold cores, but also reduces the inventory quantity of desired lenses, thereby reducing costs.